Akan (Twi) Alphabet has ten (10) vowels. All the ten vowels in Akan (Twi) are represented in Adinkra Alphabet compare to the Latin orthography in which only 7 vowels are represented. There are two subset of vowels in Akan known as +ATR and -ATR. Each subset of vowels contain 5 vowels in Adinkra Alphabet. The phenomenon in which vowels in each subset of 5 occurs together or changes the preceding vowel to a vowel within each subset is known as vowel harmony.